EP2750025A1 - Electronic shelf labeling system - Google Patents
Electronic shelf labeling system Download PDFInfo
- Publication number
- EP2750025A1 EP2750025A1 EP13275074.6A EP13275074A EP2750025A1 EP 2750025 A1 EP2750025 A1 EP 2750025A1 EP 13275074 A EP13275074 A EP 13275074A EP 2750025 A1 EP2750025 A1 EP 2750025A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- power
- esl
- resonance
- wireless power
- gateway
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/08—Fastening or securing by means not forming part of the material of the label itself
- G09F3/18—Casings, frames or enclosures for labels
- G09F3/20—Casings, frames or enclosures for labels for adjustable, removable, or interchangeable labels
- G09F3/208—Electronic labels, Labels integrating electronic displays
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/147—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q30/00—Commerce
- G06Q30/02—Marketing; Price estimation or determination; Fundraising
- G06Q30/0207—Discounts or incentives, e.g. coupons or rebates
- G06Q30/0223—Discounts or incentives, e.g. coupons or rebates based on inventory
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2370/00—Aspects of data communication
- G09G2370/16—Use of wireless transmission of display information
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2380/00—Specific applications
- G09G2380/04—Electronic labels
Definitions
- the present invention relates to an electronic shelf labeling (ESL) system, and more particularly, to an ESL system in which ESL tags are wirelessly chargeable.
- ESL electronic shelf labeling
- An electronic shelf labeling (ESL) system is one of such tag-based systems, applied to various environments such as large supermarkets in which various items are frequently provided for sale.
- an ESL system may be implemented by establishing wireless personal area networks based on local area wireless technologies such as Zigbee.
- an ESL system may include a gateway which wirelessly provides data obtained from an ESL server, and ESL tags displaying merchandise item information and the like, based on data provided from the gateway.
- ESL tags operate with their own power. Therefore, efficient power management of ESL tags is an important consideration in any ESL system.
- ESL tags are set to be in an idle state, i.e., a sleep state, for a certain period of time, and set to be in a wake-up state only when data is sent or received.
- the technology cannot provide a solution to overcome basic limitations of power management of the ESL tags, i.e. , it cannot cope with a situation in which power is consumed to an extent beyond a certain level.
- An aspect of the present invention provides an electronic shelf labeling system in which ESL tags are wirelessly charged via wireless communications, such that power management of the ESL tags can be fundamentally improved.
- an electronic shelf labeling (ESL) system including: a plurality of ESL tags displaying merchandise item information; and a gateway providing the plurality of ESL tags with update data for the merchandise item information and transmitting wireless power to at least a portion of the plurality of ESL tags by using wireless communications, wherein the at least a portion of the plurality of ESL tags are charged with the wireless power.
- ESL electronic shelf labeling
- the gateway may generate the wireless power using a magnetic resonance method or an electromagnetic method.
- the gateway may include a gateway controlling unit performing wireless communications with the plurality of ESL tags using a first frequency band to provide the update data; and a power transmission unit controlling the transmitting of the wireless power using a second frequency band different from the first frequency band.
- the gateway may further include a power transmission antenna including a resonance transmission coil, the resonance transmission coil generating a resonance frequency in the second frequency band, and the power transmission unit may control supply of driving power to the power transmission antenna so that the transmitting of the wireless power is controlled.
- Each of the ESL tags may include a power reception antenna including a resonance reception coil, the resonance reception coil resonating with the resonance frequency in the second frequency band to receive the wireless power.
- Each of the ESL tags may further include a power storage unit charged with the wireless power received by the power reception antenna; and a power management unit monitoring the power stored in the power storage unit and requesting transmission of the wireless power from the power transmission unit when a predetermined condition is satisfied.
- the power management unit may control the ESL tag to receive the wireless power in a sleep state in which the ESL tag does not receive the update data.
- the ESL system may further include an ESL system server providing the plurality of ESL tags with the update data through the gateway and monitoring respective power states of the plurality of ESL tags.
- an ESL system including: a plurality of ESL tags displaying merchandise item information; a gateway providing the plurality of ESL tags with update data for the merchandise item information and transmitting wireless power to be transmitted to at least a portion of the plurality of ESL tags by using wireless communications; and at least one repeater receiving the wireless power transmitted from the gateway and retransmitting the wireless power to the at least a portion of the plurality of ESL tags, wherein the at least a portion of the plurality of ESL tags are charged with the wireless power retransmitted by the at least one repeater.
- the gateway may include a gateway controlling unit performing wireless communications with the plurality of ESL tags using a first frequency band to provide the update data; a power transmission antenna including a resonance transmission coil, the resonance transmission coil generating a resonance frequency in a second frequency band different from the first frequency band; and a power transmission unit controlling supply of driving power to the power transmission antenna such that the transmitting of the wireless power is controlled.
- the repeater may include a power reception antenna including a resonance reception coil, the resonance reception coil resonating with the resonance frequency in the second frequency band to receive the wireless power; and a power transmission antenna including a resonance transmission coil, the resonance transmission coil generating a resonance frequency in a third frequency band different from the first and second frequency bands, using the received wireless power.
- Each of the ESL tags may include a power reception antenna including a resonance reception coil, the resonance reception coil resonating with the resonance frequency in the third frequency band to receive the wireless power; a power storage unit charged with the wireless power received by the power reception antenna; and a power management unit monitoring the power stored in the power storage unit and requesting transmission of the wireless power from the repeater when a predetermined condition is satisfied.
- the repeater may include a power transceiver antenna re-resonating with and transmitting the resonance frequency in the second frequency band generated by the gateway.
- Each of the ESL tags may include a power reception antenna including a resonance reception coil, the resonance reception coil resonating with the resonance frequency in the second frequency band transmitted from the repeater to receive the wireless power; a power storage unit charged with the wireless power received by the power reception antenna; and a power management unit monitoring the power stored in the power storage unit and requesting transmission of the wireless power from the repeater when a predetermined condition is satisfied.
- FIG. 1 is a diagram illustrating an electronic shelf labeling system according to an embodiment of the present invention.
- ESL electronic shelf labeling
- ESL tags 300 may be wirelessly charged using wireless power.
- the ESL system may include an ESL server 100, at least one gateway 200, and a plurality of ESL tags 300.
- the ESL server 100 may provide the ESL tags 300 with data for update via the gateway 200.
- the ESL server 100 and the gateway 200 may be connected to each other in a wired or wireless manner.
- the ESL server 100 may monitor respective power states of the ESL tags 300.
- the ESL system may further include a management terminal (not shown), and the ESL server 100 may provide the management terminal with monitoring data on the power states of the ESL tags 300.
- the gateway 200 may provide the ESL tags 300 with update data of information on merchandise items using wireless communications. For instance, the gateway 200 may broadcast wake-up messages to the ESL tags 300 over wake-up channels, and, when one of the ESL tags 300 that has received the wake-up messages requests update data, the gateway 200 may provide the corresponding ESL tag with update data over an update channel.
- the gateway 200 may transmit wireless power to at least a portion of the ESL tags.
- the gateway 300 may supply power in a wireless manner, and the term "wireless power" refers to power supplied in a wireless manner.
- wireless power may be supplied by a magnetic resonance method using a resonance frequency or by an electromagnetic method using microwaves.
- the ESL tags 300 may indicate information on merchandise items.
- the ESL tags 300 may update the information by receiving update data via the gateway 200.
- the ESL tags 300 may charge themselves using the wireless power supplied from the gateway 200.
- the ESL server 100, the gateway 200 and the ESL tags 300 will be described in more detail with reference to FIGS. 2 through 5 .
- FIG. 2 is a diagram illustrating an ESL server according to an embodiment of the present invention.
- the ESL server 100 may include a communications unit 110, an update management unit 120, an update database 130, a gateway database140, and a power monitoring unit 150.
- the communications unit 110 may perform communications with the gateway 200.
- the update management unit 120 may provide the gateway 200 with update data.
- the ESL server 100 may provide the update data to a corresponding gateway 200 able to directly communicate with the specific ESL tag.
- the ESL server 100 may include the gateway, the gateway database 140 storing information on the corresponding gateway and nodes associated therewith, and the update database 130 storing update data.
- the update management unit 120 may receive information on merchandise items from the outside to update the database 140.
- the power monitoring unit 150 may maintain monitoring data on power states of the ESL tags 300 included in the ESL system.
- the ESL tags 300 may provide the gateway with their information on power states, and the power monitoring unit 150 may collect the information on power states to create or update the monitoring data.
- the power monitoring unit 150 may provide a separate management terminal (not shown) with the monitoring data in a wired or wireless manner. Accordingly, a manager may easily monitor the power states of the ESL tags 300 included in the ESL system using a management terminal such as a PDA.
- FIG. 3 is a diagram illustrating a gateway according to an embodiment of the present invention.
- the gateway 200 may include a communications unit 210, a gateway controlling unit 220, an update storage unit 230, a power transmission unit 240, and a power reception antenna 250.
- the communications unit 210 may include a first communications module and a second communications module.
- the first communications module may configure communications with the ESL server 100 and the second communications module may configure communications with the ESL tags 300.
- the second communications module may be configured of two communications modules (i.e., a wake-up communications module and a data channel communications module) performing respective communications using different frequency bands.
- the gateway controlling unit 220 may control other components of the gateway 200.
- the gateway controlling unit 220 may perform wireless communications with the plurality of ESL tags using a first frequency band to provide update data.
- the first frequency band includes a frequency band of the update data channel and a frequency band of the data channel. That is to say, the first frequency band is so named for the purpose of distinguishing it from the second frequency band supplying wireless power to be described, but the first frequency band does not necessarily refer to a single frequency band.
- the gateway controlling unit 220 may control update data obtained from the ESL server 100 to be stored in the update storage unit 240. This is necessary because the update data needs to be temporarily stored in the gateway 200 until the corresponding ESL tag 300 enters a wake-up state.
- the gateway controlling unit 220 may regularly broadcast a wake-up message to the ESL tag 300 over a wake-up channel.
- broadcasting refers to transmitting data according to a communications protocol which does not require a response from a receiving side.
- the gateway controlling unit 220 may broadcast a wake-up message under the control of the ESL server 100.
- the wake-up message may include an identifier to identify a corresponding ESL tag to be updated.
- the gateway controlling unit 220 may search the update storage unit 230 for corresponding update data to provide the corresponding update data to the ESL tag 300.
- the update storage unit 240 may store the update data provided from the ESL server 100.
- the power transmission unit 240 may control the supply of wireless power using a second frequency band different from the first frequency band.
- the power transmission unit 240 may control wireless power such that it is only supplied when the ESL tags 300 are not in a wake-up state (i.e. , when the ESL tags 300 are in a sleep state). The reason is that, during the wake-up state, transmission of a wake-up message or update data may be going on, such that it may conflict with the wireless power being supplied, even if they are being supplied using different frequency bands, or that charge efficiency is low while power is being consumed.
- the power transmission unit 240 may supply wireless power upon receiving a request from the ESL tag 300. For example, upon receiving a request for wireless power from the ESL tag 300 or determining that the power state of the ESL tag 300 is below a certain value, the power transmission unit 240 may control the power transmission antenna 250 such that it supplies wireless power.
- the power transmission unit 240 may continuously supply a constant amount of wireless power, regardless of a request from the ESL tags 300.
- the ESL tags 300 may determine whether or not to charge themselves.
- the power transmission antenna 250 may supply the ESL tags 300 with wireless power using a second frequency band.
- the gateway 200 may transmit wireless power using a magnetic resonance method.
- the power transmission antenna 250 may include a resonance transmission coil generating a resonance frequency in the second frequency band.
- the power transmission unit 240 may control the supply of driving power to the power transmission antenna, such that the supply of wireless power is controlled.
- FIG. 4 is a diagram illustrating an ESL tag according to an embodiment of the present invention.
- the ESL tag 300 may include a communications unit 310, a tag controlling unit 320, a merchandise item information storage unit 330, a display unit 340, a power management unit 350, a power storage unit 360 and a power reception antenna 370.
- the communications unit 310 may configure a wireless communications environment with the gateway 200 for update.
- the communications unit 310 like the communications unit 210 of the gateway, may be configured of two communications modules having two different frequency bands in a case in which a wake-up channel and a data channel are separately provided.
- the tag controlling unit 320 may control other components of the ESL tag 300 such that the ESL tag 300 is driven.
- the tag controlling unit 320 may set the ESL tag 300 to a sleep state or a wake-up state. For example, the tag controlling unit 320 may control the ESL tag 300 to remain in a sleep state for a certain period of time and then enter a wake-up state, and when a wake-up message from the gateway 200 includes an identification information of the corresponding ESL tag 300, the tag controlling unit 320 may transmit a request for update data to the gateway 200. When the wake-up message does not include the identification information of the corresponding ESL tag 300, the tag controlling unit 320 may set the ESL tag 300 to the sleep state for the certain period of time.
- the tag controlling unit 320 may control update data obtained from the gateway 200 to be stored in the merchandise item information storage unit 340. In an embodiment, in a case in which the tag controlling unit 320 receives update data in response to a request for update data, the update data may be stored in the merchandise item information storage unit 340.
- the tag controlling unit 320 may control the display unit 350 such that information stored in the merchandise item information storage unit 340 is displayed externally.
- the merchandise item information storage unit 330 may store update data obtained from the gateway 200.
- the display unit 350 may externally display contents corresponding to data stored in the merchandise item information storage unit 330.
- the display unit 350 includes various types of display means such as a LED, a LCD, and the like and is not limited to specific means.
- the power management unit 350 may manage the power of the ESL tag 300.
- the power management unit 350 may monitor the power of the ESL tag 300 and request wireless power from the gateway 200. For example, the power management unit 350 monitors power stored in the power storage unit 360 and requests transmission of wireless power from the gateway 200 when a predetermined condition is satisfied (e.g., residual power is below a certain value).
- a predetermined condition e.g., residual power is below a certain value.
- the power management unit 350 may generate information on the power state of the ESL tag 300 to provide the gateway 200 therewith.
- the gateway 200 may determine whether to supply wireless power to the corresponding ESL tag 300 based on the information on the power state of the ESL tag.
- the power management unit 350 may perform controlling such that wireless power is only received in a sleep state. Specifically, in the case in which the ESL tag is set, by the tag controlling unit 320, to be in the sleep state in which update data is not received, the power management unit 350 may control the power reception antenna 370 such that the wireless power supplied from the gateway 200 is only received in the sleep state.
- the power storage unit 360 may charge the ESL tag 300 using the wireless power received by the power reception antenna 370.
- the power reception antenna 370 may receive the wireless power transmitted from the gateway 200.
- the power reception antenna 370 may include a resonance reception coil which receives wireless power by resonating with a resonance frequency in the second frequency band.
- the second frequency band is different from the first frequency band for update.
- FIG. 5 is a reference diagram illustrating an example of a method of transmitting wireless power according to an embodiment of the present invention.
- a magnetic resonance method is used.
- the gateway 200 may include the power transmission antenna 250 including a resonance reception coil to generate a resonance frequency in a certain frequency band.
- the ESL tag 300 may include the power reception antenna 370 including a resonance reception coil resonating in the certain frequency band.
- the resonance frequency generated by the resonance transmission coil causes the resonance reception coil which is present within its magnetic field to resonate, such that energy is transmitted by evanescent wave coupling.
- FIG. 6 is a reference diagram schematically illustrating an ESL system according to another embodiment of the present invention
- FIG. 7 is a block diagram schematically illustrating a repeater according to an embodiment of the present invention.
- the ESL system according to another embodiment further includes a repeater 400.
- wireless power is supplied from the gateway 200 to the ESL tags 300 via the repeater 400.
- the repeater 400 may receive the wireless power transmitted from the gateway 200 to retransmit it to the ESL tags 300.
- the repeater 400 may include a repeater controlling unit 410, a power reception antenna 420 and a power transmission antenna 430. In an embodiment, the repeater 400 may further include a power storage unit 440.
- the repeater controlling unit 410 may control other components of the repeater 400.
- the repeater controlling unit 410 may use the wireless power received by the power reception antenna 420 to transmit the wireless power to the ESL tags 300 via the power transmission antenna 430.
- the repeater controlling unit 410 may control the wireless power received by the power reception antenna 420 to be stored in the power storage unit 440, and use the stored wireless power to transmit the wireless power to the ESL tags 300 via the power transmission antenna 430.
- the power reception antenna 420 may include a resonance reception coil resonating with a resonance frequency in a certain frequency band provided by the gateway 200 to receive wireless power.
- the power transmission antenna 430 may include a resonance transmission coil generating a resonance frequency in a third frequency band different from the certain frequency band provided by the gateway 200.
- the resonance transmission coil may operate by using the wireless power received by the power reception antenna 420.
- the power reception antenna 420 and the power transmission antenna 430 are separate elements using different frequencies.
- the repeater 400 may receive and transmit power using a single antenna, i.e., a single resonance coil.
- the repeater 400 may include a repeater coil of which resonance frequency matches those of the transmission coil of the gateway 200 and the reception coil of the ESL tag 300, and re-resonate with the resonance frequency of the certain frequency band generated by the gateway 200 to send it.
- the gateway 200, the repeater 400, and the ESL tags 300 may use the same resonance frequency.
- the repeater 400 may retransmit wireless power by resonance. Accordingly, separate control may not be necessary.
- resonance can be more effective.
- ESL tags are wirelessly charged via wireless communications, such that power management of the ESL tags of an ESL system can be fundamentally improved.
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Abstract
There is provided an electronic shelf labeling (ESL) system including a plurality of ESL tags displaying merchandise item information; and a gateway providing the plurality of ESL tags with update data for the merchandise item information and transmitting wireless power to at least a portion of the plurality of ESL tags by using wireless communications, wherein the at least a portion of the plurality of ESL tags are charged with the wireless power.
Description
- This application claims the priority of Korean Patent Application No.
10-2012-0156849 filed on December 28, 2012 - The present invention relates to an electronic shelf labeling (ESL) system, and more particularly, to an ESL system in which ESL tags are wirelessly chargeable.
- In general, as tag technologies and local area wireless communications advance, various tag-based systems have been developed. An electronic shelf labeling (ESL) system is one of such tag-based systems, applied to various environments such as large supermarkets in which various items are frequently provided for sale.
- Such ESL systems may be implemented by establishing wireless personal area networks based on local area wireless technologies such as Zigbee. For example, an ESL system may include a gateway which wirelessly provides data obtained from an ESL server, and ESL tags displaying merchandise item information and the like, based on data provided from the gateway.
- Here, the ESL tags operate with their own power. Therefore, efficient power management of ESL tags is an important consideration in any ESL system.
- In the related art, there is a known technology for power management, in which ESL tags are set to be in an idle state, i.e., a sleep state, for a certain period of time, and set to be in a wake-up state only when data is sent or received.
- However, the technology cannot provide a solution to overcome basic limitations of power management of the ESL tags, i.e. , it cannot cope with a situation in which power is consumed to an extent beyond a certain level.
- The following Related Art Documents fail to solve the above-mentioned problems.
-
- (Patent Document 1) Korean Patent Laid-Open Publication No.
10-2006-0053036 A - (Patent Document 2)
US Patent Application Publication No. 2011/0241843 - An aspect of the present invention provides an electronic shelf labeling system in which ESL tags are wirelessly charged via wireless communications, such that power management of the ESL tags can be fundamentally improved.
- According to an aspect of the present invention, there is provided an electronic shelf labeling (ESL) system including: a plurality of ESL tags displaying merchandise item information; and a gateway providing the plurality of ESL tags with update data for the merchandise item information and transmitting wireless power to at least a portion of the plurality of ESL tags by using wireless communications, wherein the at least a portion of the plurality of ESL tags are charged with the wireless power.
- The gateway may generate the wireless power using a magnetic resonance method or an electromagnetic method.
- The gateway may include a gateway controlling unit performing wireless communications with the plurality of ESL tags using a first frequency band to provide the update data; and a power transmission unit controlling the transmitting of the wireless power using a second frequency band different from the first frequency band.
- The gateway may further include a power transmission antenna including a resonance transmission coil, the resonance transmission coil generating a resonance frequency in the second frequency band, and the power transmission unit may control supply of driving power to the power transmission antenna so that the transmitting of the wireless power is controlled.
- Each of the ESL tags may include a power reception antenna including a resonance reception coil, the resonance reception coil resonating with the resonance frequency in the second frequency band to receive the wireless power.
- Each of the ESL tags may further include a power storage unit charged with the wireless power received by the power reception antenna; and a power management unit monitoring the power stored in the power storage unit and requesting transmission of the wireless power from the power transmission unit when a predetermined condition is satisfied.
- The power management unit may control the ESL tag to receive the wireless power in a sleep state in which the ESL tag does not receive the update data.
- The ESL system may further include an ESL system server providing the plurality of ESL tags with the update data through the gateway and monitoring respective power states of the plurality of ESL tags.
- According to another aspect of the present invention, there is provided an ESL system including: a plurality of ESL tags displaying merchandise item information; a gateway providing the plurality of ESL tags with update data for the merchandise item information and transmitting wireless power to be transmitted to at least a portion of the plurality of ESL tags by using wireless communications; and at least one repeater receiving the wireless power transmitted from the gateway and retransmitting the wireless power to the at least a portion of the plurality of ESL tags, wherein the at least a portion of the plurality of ESL tags are charged with the wireless power retransmitted by the at least one repeater.
- The gateway may include a gateway controlling unit performing wireless communications with the plurality of ESL tags using a first frequency band to provide the update data; a power transmission antenna including a resonance transmission coil, the resonance transmission coil generating a resonance frequency in a second frequency band different from the first frequency band; and a power transmission unit controlling supply of driving power to the power transmission antenna such that the transmitting of the wireless power is controlled.
- The repeater may include a power reception antenna including a resonance reception coil, the resonance reception coil resonating with the resonance frequency in the second frequency band to receive the wireless power; and a power transmission antenna including a resonance transmission coil, the resonance transmission coil generating a resonance frequency in a third frequency band different from the first and second frequency bands, using the received wireless power.
- Each of the ESL tags may include a power reception antenna including a resonance reception coil, the resonance reception coil resonating with the resonance frequency in the third frequency band to receive the wireless power; a power storage unit charged with the wireless power received by the power reception antenna; and a power management unit monitoring the power stored in the power storage unit and requesting transmission of the wireless power from the repeater when a predetermined condition is satisfied.
- The repeater may include a power transceiver antenna re-resonating with and transmitting the resonance frequency in the second frequency band generated by the gateway.
- Each of the ESL tags may include a power reception antenna including a resonance reception coil, the resonance reception coil resonating with the resonance frequency in the second frequency band transmitted from the repeater to receive the wireless power; a power storage unit charged with the wireless power received by the power reception antenna; and a power management unit monitoring the power stored in the power storage unit and requesting transmission of the wireless power from the repeater when a predetermined condition is satisfied.
- The above and other aspects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
-
FIG. 1 is a diagram schematically illustrating an electronic shelf labeling system according to an embodiment of the present invention; -
FIG. 2 is a block diagram illustrating an electronic shelf labeling server according to an embodiment of the present invention; -
FIG. 3 is a block diagram illustrating a gateway according to an embodiment of the present invention; -
FIG. 4 is a block diagram illustrating ESL tags according to an embodiment of the present invention; -
FIG. 5 is a reference diagram illustrating an example of a method of transmitting wireless power according to the present invention; -
FIG. 6 is a diagram schematically illustrating an electronic shelf labeling system according to another embodiment of the present invention; and -
FIG. 7 is a block diagram illustrating a repeater according to an embodiment of the present invention. - Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
- The invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
- Throughout the drawings, the same or like reference numerals will be used to designate the same or like elements.
-
FIG. 1 is a diagram illustrating an electronic shelf labeling system according to an embodiment of the present invention. In the electronic shelf labeling (hereinafter referred to as "ESL") system ofFIG. 1 ,ESL tags 300 may be wirelessly charged using wireless power. - More specifically, referring to
FIG. 1 , the ESL system according to the embodiment of the present invention may include anESL server 100, at least onegateway 200, and a plurality ofESL tags 300. - The
ESL server 100 may provide theESL tags 300 with data for update via thegateway 200. Here, theESL server 100 and thegateway 200 may be connected to each other in a wired or wireless manner. - Further, the
ESL server 100 may monitor respective power states of theESL tags 300. In the embodiment, the ESL system may further include a management terminal (not shown), and theESL server 100 may provide the management terminal with monitoring data on the power states of theESL tags 300. - The
gateway 200 may provide theESL tags 300 with update data of information on merchandise items using wireless communications. For instance, thegateway 200 may broadcast wake-up messages to theESL tags 300 over wake-up channels, and, when one of theESL tags 300 that has received the wake-up messages requests update data, thegateway 200 may provide the corresponding ESL tag with update data over an update channel. - Further, the
gateway 200 may transmit wireless power to at least a portion of the ESL tags. Here, thegateway 300 may supply power in a wireless manner, and the term "wireless power" refers to power supplied in a wireless manner. For example, wireless power may be supplied by a magnetic resonance method using a resonance frequency or by an electromagnetic method using microwaves. - The
ESL tags 300 may indicate information on merchandise items. TheESL tags 300 may update the information by receiving update data via thegateway 200. - Further, the
ESL tags 300 may charge themselves using the wireless power supplied from thegateway 200. - The
ESL server 100, thegateway 200 and theESL tags 300 will be described in more detail with reference toFIGS. 2 through 5 . -
FIG. 2 is a diagram illustrating an ESL server according to an embodiment of the present invention. - Referring to
FIG. 2 , theESL server 100 may include acommunications unit 110, anupdate management unit 120, anupdate database 130, a gateway database140, and apower monitoring unit 150. - The
communications unit 110 may perform communications with thegateway 200. - The
update management unit 120 may provide thegateway 200 with update data. For example, in a case in which there is update data for a specific ESL tag among the ESL tags 300, theESL server 100 may provide the update data to acorresponding gateway 200 able to directly communicate with the specific ESL tag. - To this end, the
ESL server 100 may include the gateway, thegateway database 140 storing information on the corresponding gateway and nodes associated therewith, and theupdate database 130 storing update data. - In an embodiment, the
update management unit 120 may receive information on merchandise items from the outside to update thedatabase 140. - The
power monitoring unit 150 may maintain monitoring data on power states of the ESL tags 300 included in the ESL system. In an embodiment, the ESL tags 300 may provide the gateway with their information on power states, and thepower monitoring unit 150 may collect the information on power states to create or update the monitoring data. - In an embodiment, the
power monitoring unit 150 may provide a separate management terminal (not shown) with the monitoring data in a wired or wireless manner. Accordingly, a manager may easily monitor the power states of the ESL tags 300 included in the ESL system using a management terminal such as a PDA. -
FIG. 3 is a diagram illustrating a gateway according to an embodiment of the present invention. - Referring to
FIG. 3 , thegateway 200 may include acommunications unit 210, agateway controlling unit 220, anupdate storage unit 230, apower transmission unit 240, and apower reception antenna 250. - The
communications unit 210 may include a first communications module and a second communications module. Here, the first communications module may configure communications with theESL server 100 and the second communications module may configure communications with the ESL tags 300. In an embodiment in which the ESL tags 300, a wake-up channel, and a data channel are separately provided, the second communications module may be configured of two communications modules (i.e., a wake-up communications module and a data channel communications module) performing respective communications using different frequency bands. - The
gateway controlling unit 220 may control other components of thegateway 200. - The
gateway controlling unit 220 may perform wireless communications with the plurality of ESL tags using a first frequency band to provide update data. Here, when an update data channel and a data channel are separately used, the first frequency band includes a frequency band of the update data channel and a frequency band of the data channel. That is to say, the first frequency band is so named for the purpose of distinguishing it from the second frequency band supplying wireless power to be described, but the first frequency band does not necessarily refer to a single frequency band. - In an embodiment, the
gateway controlling unit 220 may control update data obtained from theESL server 100 to be stored in theupdate storage unit 240. This is necessary because the update data needs to be temporarily stored in thegateway 200 until thecorresponding ESL tag 300 enters a wake-up state. - In an embodiment, the
gateway controlling unit 220 may regularly broadcast a wake-up message to theESL tag 300 over a wake-up channel. Here, broadcasting refers to transmitting data according to a communications protocol which does not require a response from a receiving side. In an embodiment, thegateway controlling unit 220 may broadcast a wake-up message under the control of theESL server 100. The wake-up message may include an identifier to identify a corresponding ESL tag to be updated. - Upon receiving a request for update data from the corresponding ESL tag having received the wake-up message, the
gateway controlling unit 220 may search theupdate storage unit 230 for corresponding update data to provide the corresponding update data to theESL tag 300. - The
update storage unit 240 may store the update data provided from theESL server 100. - The
power transmission unit 240 may control the supply of wireless power using a second frequency band different from the first frequency band. - In an embodiment, the
power transmission unit 240 may control wireless power such that it is only supplied when the ESL tags 300 are not in a wake-up state (i.e. , when the ESL tags 300 are in a sleep state). The reason is that, during the wake-up state, transmission of a wake-up message or update data may be going on, such that it may conflict with the wireless power being supplied, even if they are being supplied using different frequency bands, or that charge efficiency is low while power is being consumed. - In an embodiment, the
power transmission unit 240 may supply wireless power upon receiving a request from theESL tag 300. For example, upon receiving a request for wireless power from theESL tag 300 or determining that the power state of theESL tag 300 is below a certain value, thepower transmission unit 240 may control thepower transmission antenna 250 such that it supplies wireless power. - In another embodiment, the
power transmission unit 240 may continuously supply a constant amount of wireless power, regardless of a request from the ESL tags 300. In this case, the ESL tags 300 may determine whether or not to charge themselves. - The
power transmission antenna 250 may supply the ESL tags 300 with wireless power using a second frequency band. - In an embodiment, the
gateway 200 may transmit wireless power using a magnetic resonance method. In this case, thepower transmission antenna 250 may include a resonance transmission coil generating a resonance frequency in the second frequency band. In this manner, thepower transmission unit 240 may control the supply of driving power to the power transmission antenna, such that the supply of wireless power is controlled. -
FIG. 4 is a diagram illustrating an ESL tag according to an embodiment of the present invention. - Referring to
FIG. 4 , theESL tag 300 may include acommunications unit 310, atag controlling unit 320, a merchandise iteminformation storage unit 330, adisplay unit 340, apower management unit 350, apower storage unit 360 and apower reception antenna 370. - The
communications unit 310 may configure a wireless communications environment with thegateway 200 for update. Thecommunications unit 310, like thecommunications unit 210 of the gateway, may be configured of two communications modules having two different frequency bands in a case in which a wake-up channel and a data channel are separately provided. - The
tag controlling unit 320 may control other components of theESL tag 300 such that theESL tag 300 is driven. - In an embodiment, the
tag controlling unit 320 may set theESL tag 300 to a sleep state or a wake-up state. For example, thetag controlling unit 320 may control theESL tag 300 to remain in a sleep state for a certain period of time and then enter a wake-up state, and when a wake-up message from thegateway 200 includes an identification information of thecorresponding ESL tag 300, thetag controlling unit 320 may transmit a request for update data to thegateway 200. When the wake-up message does not include the identification information of thecorresponding ESL tag 300, thetag controlling unit 320 may set theESL tag 300 to the sleep state for the certain period of time. - In an embodiment, the
tag controlling unit 320 may control update data obtained from thegateway 200 to be stored in the merchandise iteminformation storage unit 340. In an embodiment, in a case in which thetag controlling unit 320 receives update data in response to a request for update data, the update data may be stored in the merchandise iteminformation storage unit 340. - In an embodiment, the
tag controlling unit 320 may control thedisplay unit 350 such that information stored in the merchandise iteminformation storage unit 340 is displayed externally. - The merchandise item
information storage unit 330 may store update data obtained from thegateway 200. - The
display unit 350 may externally display contents corresponding to data stored in the merchandise iteminformation storage unit 330. Thedisplay unit 350 includes various types of display means such as a LED, a LCD, and the like and is not limited to specific means. - The
power management unit 350 may manage the power of theESL tag 300. - In an embodiment, the
power management unit 350 may monitor the power of theESL tag 300 and request wireless power from thegateway 200. For example, thepower management unit 350 monitors power stored in thepower storage unit 360 and requests transmission of wireless power from thegateway 200 when a predetermined condition is satisfied (e.g., residual power is below a certain value). - In an embodiment, the
power management unit 350 may generate information on the power state of theESL tag 300 to provide thegateway 200 therewith. Thegateway 200 may determine whether to supply wireless power to thecorresponding ESL tag 300 based on the information on the power state of the ESL tag. - In an embodiment, the
power management unit 350 may perform controlling such that wireless power is only received in a sleep state. Specifically, in the case in which the ESL tag is set, by thetag controlling unit 320, to be in the sleep state in which update data is not received, thepower management unit 350 may control thepower reception antenna 370 such that the wireless power supplied from thegateway 200 is only received in the sleep state. - The
power storage unit 360 may charge theESL tag 300 using the wireless power received by thepower reception antenna 370. - The
power reception antenna 370 may receive the wireless power transmitted from thegateway 200. In a magnetic resonance method, as an example, thepower reception antenna 370 may include a resonance reception coil which receives wireless power by resonating with a resonance frequency in the second frequency band. Here, as described above, the second frequency band is different from the first frequency band for update. -
FIG. 5 is a reference diagram illustrating an example of a method of transmitting wireless power according to an embodiment of the present invention. In the example shown inFIG. 5 , a magnetic resonance method is used. - Referring to
FIG. 5 , thegateway 200 may include thepower transmission antenna 250 including a resonance reception coil to generate a resonance frequency in a certain frequency band. - In addition, the
ESL tag 300 may include thepower reception antenna 370 including a resonance reception coil resonating in the certain frequency band. - Accordingly, the resonance frequency generated by the resonance transmission coil causes the resonance reception coil which is present within its magnetic field to resonate, such that energy is transmitted by evanescent wave coupling.
- As can be seen, since every resonance reception coil within the range of the resonance frequency generated by the resonance transmission coil, i.e., the range of the magnetic field, resonates, transmission/reception efficiency of wireless power is increased. In addition, such a magnetic resonance method is less directional and is less affected by obstacles, thereby increasing power transmission efficiency.
-
FIG. 6 is a reference diagram schematically illustrating an ESL system according to another embodiment of the present invention, andFIG. 7 is a block diagram schematically illustrating a repeater according to an embodiment of the present invention. - Hereinafter, the ESL system according to another embodiment will be described in more detail with reference to
FIGS. 6 and7 . Hereinafter, elements the same as or equivalent to the elements described above with reference toFIG. 1 through 5 will not be described again. However, those skilled in the art would easily understand the ESL system according to the above description. - Referring to
FIG. 6 and7 , the ESL system according to another embodiment further includes arepeater 400. - In the embodiment shown in
FIG. 6 and7 , wireless power is supplied from thegateway 200 to the ESL tags 300 via therepeater 400. - Further, the
repeater 400 may receive the wireless power transmitted from thegateway 200 to retransmit it to the ESL tags 300. - The
repeater 400 may include arepeater controlling unit 410, apower reception antenna 420 and apower transmission antenna 430. In an embodiment, therepeater 400 may further include apower storage unit 440. - The
repeater controlling unit 410 may control other components of therepeater 400. - In an embodiment, the
repeater controlling unit 410 may use the wireless power received by thepower reception antenna 420 to transmit the wireless power to the ESL tags 300 via thepower transmission antenna 430. - In an embodiment, the
repeater controlling unit 410 may control the wireless power received by thepower reception antenna 420 to be stored in thepower storage unit 440, and use the stored wireless power to transmit the wireless power to the ESL tags 300 via thepower transmission antenna 430. - The
power reception antenna 420 may include a resonance reception coil resonating with a resonance frequency in a certain frequency band provided by thegateway 200 to receive wireless power. - The
power transmission antenna 430 may include a resonance transmission coil generating a resonance frequency in a third frequency band different from the certain frequency band provided by thegateway 200. In this case, the resonance transmission coil may operate by using the wireless power received by thepower reception antenna 420. - In the embodiment described above, the
power reception antenna 420 and thepower transmission antenna 430 are separate elements using different frequencies. - However, in another embodiment, the
repeater 400 may receive and transmit power using a single antenna, i.e., a single resonance coil. Specifically, therepeater 400 may include a repeater coil of which resonance frequency matches those of the transmission coil of thegateway 200 and the reception coil of theESL tag 300, and re-resonate with the resonance frequency of the certain frequency band generated by thegateway 200 to send it. In other words, thegateway 200, therepeater 400, and the ESL tags 300 may use the same resonance frequency. In this case, therepeater 400 may retransmit wireless power by resonance. Accordingly, separate control may not be necessary. In addition, in this configuration, when therepeater 400 is located in a space between thegateway 200 and the ESL tags 300, resonance can be more effective. - As set forth above, according to embodiments of the invention, ESL tags are wirelessly charged via wireless communications, such that power management of the ESL tags of an ESL system can be fundamentally improved.
- While the present invention has been shown and described in connection with the embodiments, it will be apparent to those skilled in the art that modifications and variations can be made without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (14)
- An electronic shelf labeling (ESL) system comprising:a plurality of ESL tags displaying merchandise item information; anda gateway providing the plurality of ESL tags with update data for the merchandise item information and transmitting wireless power to at least a portion of the plurality of ESL tags by using wireless communications,wherein the at least a portion of the plurality of ESL tags are charged with the wireless power.
- The ESL system of claim 1, wherein the gateway generates the wireless power using a magnetic resonance method or an electromagnetic method.
- The ESL system of claim 2, wherein the gateway includes:a gateway controlling unit performing wireless communications with the plurality of ESL tags using a first frequency band to provide the update data; anda power transmission unit controlling the transmitting of the wireless power using a second frequency band different from the first frequency band.
- The ESL system of claim 3, wherein the gateway further includes a power transmission antenna including a resonance transmission coil, the resonance transmission coil generating a resonance frequency in the second frequency band, and
the power transmission unit controls supply of driving power to the power transmission antenna so that the transmitting of the wireless power is controlled. - The ESL system of claim 3 or 4, wherein each of the ESL tags includes a power reception antenna including a resonance reception coil, the resonance reception coil resonating with the resonance frequency in the second frequency band to receive the wireless power.
- The ESL system of claim 5, wherein each of the ESL tags further includes:a power storage unit charged with the wireless power received by the power reception antenna; anda power management unit monitoring the power stored in the power storage unit and requesting transmission of the wireless power from the power transmission unit when a predetermined condition is satisfied.
- The ESL system of claim 6, wherein the power management unit controls the ESL tag to receive the wireless power in a sleep state in which the ESL tag does not receive the update data.
- The ESL system of claim 1, further comprising an ESL system server providing the plurality of ESL tags with the update data through the gateway and monitoring respective power states of the plurality of ESL tags.
- An electronic shelf labeling system (ESL) comprising:a plurality of ESL tags displaying merchandise item information;a gateway providing the plurality of ESL tags with update data for the merchandise item information and transmitting wireless power to be transmitted to at least a portion of the plurality of ESL tags by using wireless communications; andat least one repeater receiving the wireless power transmitted from the gateway and retransmitting the wireless power to the at least a portion of the plurality of ESL tags,wherein the at least a portion of the plurality of ESL tags are charged with the wireless power retransmitted by the at least one repeater.
- The ESL system of claim 9, wherein the gateway includes:a gateway controlling unit performing wireless communications with the plurality of ESL tags using a first frequency band to provide the update data;a power transmission antenna including a resonance transmission coil, the resonance transmission coil generating a resonance frequency in a second frequency band different from the first frequency band; anda power transmission unit controlling supply of driving power to the power transmission antenna such that the transmitting of the wireless power is controlled.
- The ESL system of claim 10, wherein the repeater includes:a power reception antenna including a resonance reception coil, the resonance reception coil resonating with the resonance frequency in the second frequency band to receive the wireless power; anda power transmission antenna including a resonance transmission coil, the resonance transmission coil generating a resonance frequency in a third frequency band different from the first and second frequency bands, using the received wireless power.
- The ESL system of claim 11, wherein each of the ESL tags includes:a power reception antenna including a resonance reception coil, the resonance reception coil resonating with the resonance frequency in the third frequency band to receive the wireless power;a power storage unit charged with the wireless power received by the power reception antenna; anda power management unit monitoring the power stored in the power storage unit and requesting transmission of the wireless power from the repeater when a predetermined condition is satisfied.
- The ESL system of claim 10, wherein the repeater includes a power transceiver antenna re-resonating with and transmitting the resonance frequency in the second frequency band generated by the gateway.
- The ESL system of claim 13, wherein each of the ESL tags includes:a power reception antenna including a resonance reception coil, the resonance reception coil resonating with the resonance frequency in the second frequency band transmitted from the repeater to receive the wireless power;a power storage unit charged with the wireless power received by the power reception antenna; anda power management unit monitoring the power stored in the power storage unit and requesting transmission of the wireless power from the repeater when a predetermined condition is satisfied.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020120156849A KR101434060B1 (en) | 2012-12-28 | 2012-12-28 | Electronics shelf label system |
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EP2750025A1 true EP2750025A1 (en) | 2014-07-02 |
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ID=48049912
Family Applications (1)
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EP13275074.6A Withdrawn EP2750025A1 (en) | 2012-12-28 | 2013-03-22 | Electronic shelf labeling system |
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EP (1) | EP2750025A1 (en) |
JP (1) | JP2014131460A (en) |
KR (1) | KR101434060B1 (en) |
CN (1) | CN103914671A (en) |
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CN104598948A (en) * | 2015-02-27 | 2015-05-06 | 绿泰信息科技(上海)有限公司 | Off-line ESL (electronic shelf label) system |
WO2020082068A1 (en) | 2018-10-19 | 2020-04-23 | Ossia Inc. | Wireless power enabled electronic shelf label |
WO2021129932A1 (en) * | 2019-12-23 | 2021-07-01 | Ses-Imagotag Gmbh | Electronic shelf labelling system comprising an energy supply for long-term operation by consumers of a shelf label |
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Also Published As
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KR101434060B1 (en) | 2014-08-25 |
KR20140086404A (en) | 2014-07-08 |
JP2014131460A (en) | 2014-07-10 |
CN103914671A (en) | 2014-07-09 |
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